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Opus 5 is a great employee and a frustrating boss
Opus 5 matches Fable 5 on the benchmarks at half the token price, yet the first week of complaints is real too. Where it shines, and where it needs a boss.
Model releases, benchmarks, experiments and guides for developers who work with AI every day. Written from real use, with sources for every claim.
Latest post
Opus 5 matches Fable 5 on the benchmarks at half the token price, yet the first week of complaints is real too. Where it shines, and where it needs a boss.
GPT-5.6 Sol found 400 audit issues where Fable 5 found 70, then over-engineered the fixes. Same trait, both results. The working contract that tames it.